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The more content you have, the more prominently you want to display your search feature. If search is essential for your site, use plenty of contrast so that the field and icon stands out from the background and from the surrounding elements.
Tip: Limit your hint to just a few words, otherwise you actually increase the cognitive load.
Highlight differences between the inputted information andsuggested information (e.g., input text has a standard weight, while suggested terms have bold weight).